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        <h1 id="JavaScript-Promise-all源码"><a href="#JavaScript-Promise-all源码" class="headerlink" title="JavaScript-Promise.all源码"></a>JavaScript-Promise.all源码</h1><p>​        Promise，可以说是前端 js 面试里面的高频考点了。上次面试就让我手撕了一个Promise.all 方法的源码</p>
<p>​        这里，我先给出promise all方法的要求</p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/Promise/all</span><br></pre></td></tr></table></figure>

<ul>
<li>首先，大概就是一个可迭代的参数传递，返回一个promise的实例。对于所有都all时，返回resolve，对于失败，返回rejected。</li>
</ul>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line">Promise.all = function(promises) &#123;</span><br><span class="line">  // 因为是可迭代的，同时参数可以是set，map等，所以我们可以先使用 ... 进行全部划分为数组</span><br><span class="line">  const requests = [...promises]</span><br><span class="line"></span><br><span class="line">  // 同时因为返回是 promise，所以</span><br><span class="line">  return new Promise((resolve, reject) =&gt; &#123;</span><br><span class="line">    </span><br><span class="line">  &#125;)</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<ul>
<li>其次，需要进行依次的请求，在 res push进返回的resolve数组，err，直接reject回去。</li>
</ul>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br></pre></td><td class="code"><pre><span class="line">Promise.all = function(promises) &#123;</span><br><span class="line">  // 因为是可迭代的，同时参数可以是set，map等，所以我们可以先使用 ... 进行全部划分为数组</span><br><span class="line">  const requests = [...promises]</span><br><span class="line">  const resArr = []</span><br><span class="line"></span><br><span class="line">  // 同时因为返回是 promise，所以</span><br><span class="line">  return new Promise((resolve, reject) =&gt; &#123;</span><br><span class="line">  	// 依次进行循环，操作</span><br><span class="line">    for (let i = 0; i &lt; requests.length; i++) &#123;</span><br><span class="line">      const request = requests[i]</span><br><span class="line">      // 判断为 then 还是 catch</span><br><span class="line">      request.then(res =&gt; &#123;</span><br><span class="line">      	// res，push进数组</span><br><span class="line">        resArr.push(res)</span><br><span class="line">      &#125;, err =&gt; &#123;</span><br><span class="line">      	// catch 直接 rejected</span><br><span class="line">        reject(err)</span><br><span class="line">      &#125;)</span><br><span class="line">    &#125;</span><br><span class="line">  &#125;)</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<p>​        这里，我们有了一个初步的，然后就是需要判断如果push全部都结束了，那么就应该resolve数组了。</p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">count++;</span><br><span class="line">resArr.push(res)</span><br><span class="line">if (count === requests.length) resolve(resArr)</span><br></pre></td></tr></table></figure>

<p>​        这里也没有什么，就是进行push，然后判断是否push结束了。</p>
<p>​        写到这里，突然发现一个问题，那就是，不能使用 push 啊，因为异步的不确定性，需要使用下标进行赋值，不然返回的结果会是乱的。</p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br></pre></td><td class="code"><pre><span class="line">Promise.all = function(promises) &#123;</span><br><span class="line">  // 因为是可迭代的，同时参数可以是set，map等，所以我们可以先使用 ... 进行全部划分为数组</span><br><span class="line">  const requests = [...promises]</span><br><span class="line">  const resArr = []</span><br><span class="line">  let count = 0;</span><br><span class="line"></span><br><span class="line">  // 同时因为返回是 promise，所以</span><br><span class="line">  return new Promise((resolve, reject) =&gt; &#123;</span><br><span class="line">    for (let i = 0; i &lt; requests.length; i++) &#123;</span><br><span class="line">      const request = requests[i]</span><br><span class="line">      request.then(res =&gt; &#123;</span><br><span class="line">        count++;</span><br><span class="line">        // resArr.push(res)</span><br><span class="line">        resArr[i] = res</span><br><span class="line">        if (count === requests.length) resolve(resArr)</span><br><span class="line">      &#125;, err =&gt; &#123;</span><br><span class="line">        reject(err)</span><br><span class="line">      &#125;)</span><br><span class="line">    &#125;</span><br><span class="line">  &#125;)</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<p>​        到了这里，感觉快差不多了，但是我们还需要对传递的参数进行一个判断，对于不是Promise的，我们需要直接resolve成功。</p>
<p>​        创建一个 promise判断的函数。这里有两个思路。</p>
<ul>
<li>判断 存在req，同时 then 为function</li>
<li>判断 req为对象，同时 then为function。</li>
</ul>
<p>当然，最后我选择了第一个，因为判断req为对象，需要使用Object.prototype.toString 方法，因为 typeof 对 null 为 object，这里就需要进行额外思考，不然会 req.then 报错。</p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line">function isPromise(req) &#123;</span><br><span class="line">  // req 是一个对象，同时then是一个方法。</span><br><span class="line">  if (req &amp;&amp; typeof req.then === &#x27;function&#x27;) &#123;</span><br><span class="line">    return true</span><br><span class="line">  &#125;</span><br><span class="line">  return false</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<p>​        创建一个添加进入数组的函数</p>
<p>​    这里，我们将resArr[i] 直接复制为 res。可以避免异步产生返回结果不同步出现的问题。</p>
<p>​    同时我们是通过返回一个 bool 来判断运行是否应该结束，当然。这个问题在于我们在resolve之后，可能是最后一个resolve，所以需要再resolve出去，</p>
<p>​    这里有两个方法</p>
<ul>
<li>第一个就是我现在的写法，通过返回bool，判断是否结束，然后在另一个地方进行resolve 处理</li>
<li>第二个就是利用了闭包的效果，我们将函数写在了 return new Promise(() =&gt; {}) 里面，这样就可以使用闭包，我们只需要在函数里面进行判断是否应该resolve，而不是在外面添加一个判断。</li>
</ul>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line">// 进行添加到resArr数组里面，同时判断是否为最后一个</span><br><span class="line">function requestResolve(res, i) &#123;</span><br><span class="line">  // count++;</span><br><span class="line">  resArr[i] = res</span><br><span class="line">  return ++count === requests.length;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<p>​        其实，这里我也不好决定使用哪一种，因为我的代码的切割水平不到位，不知道这个 resolve，应该放在 new promise里面，还是说放在方法内部，主要是放在方法内部，给我一种逻辑被划开了的感觉。</p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br></pre></td><td class="code"><pre><span class="line">Promise.all = function(promises) &#123;</span><br><span class="line">  // 因为是可迭代的，同时参数可以是set，map等，所以我们可以先使用 ... 进行全部划分为数组</span><br><span class="line">  const requests = [...promises]</span><br><span class="line">  const resArr = []</span><br><span class="line">  let count = 0;</span><br><span class="line"></span><br><span class="line">  function isPromise(req) &#123;</span><br><span class="line">    // req 是一个对象，同时then是一个方法。</span><br><span class="line">    if (typeof req === &#x27;object&#x27;</span><br><span class="line">        &amp;&amp; typeof req.then === &#x27;function&#x27;) &#123;</span><br><span class="line">      return true</span><br><span class="line">    &#125;</span><br><span class="line">    return false</span><br><span class="line">  &#125;</span><br><span class="line"></span><br><span class="line">  // 进行添加到resArr数组里面，同时判断是否为最后一个</span><br><span class="line">  function requestResolve(res, i) &#123;</span><br><span class="line">    // count++;</span><br><span class="line">    resArr[i] = res</span><br><span class="line">    return ++count === requests.length;</span><br><span class="line">  &#125;</span><br><span class="line"></span><br><span class="line">  // 同时因为返回是 promise，所以</span><br><span class="line">  return new Promise((resolve, reject) =&gt; &#123;</span><br><span class="line">    for (let i = 0; i &lt; requests.length; i++) &#123;</span><br><span class="line">      const request = requests[i]</span><br><span class="line">      if (isPromise(request)) &#123;</span><br><span class="line">        request.then(res =&gt; &#123;</span><br><span class="line">        	// 这里我是将其分割开来，感觉这样逻辑是分开的。</span><br><span class="line">          requestResolve(res, i) &amp;&amp; resolve(resArr)</span><br><span class="line">        &#125;, err =&gt; &#123;</span><br><span class="line">          reject(err)</span><br><span class="line">        &#125;)</span><br><span class="line">        // err 可以直接使用 reject</span><br><span class="line">        // req.then(res =&gt; &#123;&#125;, reject)。</span><br><span class="line">        // 高级，看了别人的代码就是不一样。</span><br><span class="line">      &#125; else &#123;</span><br><span class="line">        requestResolve(request, i) &amp;&amp; resolve(resArr)</span><br><span class="line">      &#125;</span><br><span class="line">    &#125;</span><br><span class="line">  &#125;)</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>






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